Selfoss v2.13-6 not available on my DS218+ with DSM 6.2.1-23824 Update 1

[ElDuderino79]

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Setup

Package Name: Selfoss
Package Version: v2.13-6

NAS Model: DS218+
NAS Architecture: apollolake (x64) (if this is true)
DSM version: 6.2.1-23824 Update 1

3rd Party Package added: packages.synocommunity.com

Expected behavior

Selfoss does not show up anymore since I upgraded from DS214play to DS218+. Unfortunately I cannot install it and it seams as if there is no package available for "apollolake (x64)". Hopefully someone can make this available?